Can you provide information such as where you ordered, what micro SD card you used, etc.?

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i have a 3ds eu with game pal

i used 3 different microsd
1 kingston 2GB
1 Kodak 2GB
1 kingston 8GB
the card has worked only one time yesterdey
the first time (with luigi mansion) the 3ds tell me "i can't save" reboot, after it tell me the cartridge is removed.
after more time ....after i have clean the contact, the card work, i tried 3 game:
layton OK and save
puzzle bobble OK abd save
luigi mansion OK but do't save

You need to format the SD card to FAT32, according to Gateway's instructions. That might be your problem.EDIT: Make sure you back up everything on the SD card before formatting, if you delete eShop games you won't be able to re-download them.

Some GW cards is poorly produced. You may be just unlucky that got such ones.
There are guys reporting similar faults on Chinese Forums.
For the sake i would not post their names here, just to make a conclusion.
1.Some tf cards that not legit enough would cause errors, including freezes/ exit failure.
They even recommend me to get a C10 Sandisk or other brands.. (Note: Not kingston)
2.Some GW cards have already been confirmed to be bad ones.
Someone even just played for 3 hours, and got his card inavailable the next day.
He contacted the reseller and after confirmed that is really broken, the reseller changed his card.
3.Some 3DS Models including the first JAP models may even have faults in the 3ds itself.

Since you told us some clues, i think that is your GW red card got dead not your tf card.
Just ask for change the card. There are differences in product between the first batch of GW and the second.
Hope you enjoy yourself. If not believed in me you can try more methods. BTW cleaning is often good.

There are differences in product between the first batch of GW and the second.

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Did the build quality decline or improve with the second batch? With these reports of faulty cards I might just wait a month or two to purchase a gateway. Will this improve my chances of getting a better quality unit (with the manufacturing issues being sorted out)?